diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/Fl_cocoa.mm | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/Fl_cocoa.mm b/src/Fl_cocoa.mm index 85f8e8e4e..dfdbff8e1 100644 --- a/src/Fl_cocoa.mm +++ b/src/Fl_cocoa.mm @@ -4335,9 +4335,25 @@ void Fl_Cocoa_Window_Driver::capture_titlebar_and_borders(Fl_Shared_Image*& top, uchar *rgba = new uchar[4 * w() * htop * 4]; CGContextRef auxgc = CGBitmapContextCreate(rgba, 2 * w(), 2 * htop, 8, 8 * w(), cspace, kCGImageAlphaPremultipliedLast); CGColorSpaceRelease(cspace); + memset(rgba, 0xff, 4 * w() * htop * 4); // initialize to opaque white CGContextScaleCTM(auxgc, 2, 2); if (layer) { Fl_Cocoa_Window_Driver::draw_layer_to_context(layer, auxgc, w(), htop); + if (fl_mac_os_version >= 101300) { + // drawn layer is left transparent and alpha-premultiplied: demultiply it and set it opaque. + uchar *p = rgba; + uchar *last = rgba + 4 * w() * htop * 4; + while (p < last) { + uchar q = *(p+3); + if (q) { + float m = 255./q; + *p++ *= m; + *p++ *= m; + *p++ *= m; + *p++ = 0xff; + } else p += 4; + } + } } else { CGImageRef img = CGImage_from_window_rect(0, -htop, w(), htop); CGContextSaveGState(auxgc); |